They say that the attacks killed six troops at a security checkpoint in the southern coastal city of Shukra in Abyan province, and another five in the province of Hadramawt.
The security officials spoke on condition of anonymity because they were not authorized to brief the media.
The United States has stepped up airstrikes as part of a sustained assault on al-Qaida in the Arabian Peninsula in areas of Yemen where it is most active, after a late-January special operations raid that resulted in the death of a Navy SEAL.
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